They make them in huge coils. Like a slinky, you pull the top and it will unravel into loops. The loops are easier to catch tires or get wrapped up in tank tracks. If you ram the fence down and the razer wire was completely straight, you could just drive over it and likely make it through. If you ram a fence down and drive through the coiled razer, it will get wrapped up and likely immobilize whatever you’re driving.
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